# HG changeset patch
# User Rob Landley <rob@landley.net>
# Date 1453087132 21600
# Node ID c8293b3ab81f31d5f82281cff58c6944b813bb42
# Parent  47fe4b7798136110cdbb65be3999cd673bf880e7
Teach chroot-splice to accept one or two arguments. (Control image now optional.)

diff -r 47fe4b779813 -r c8293b3ab81f more/chroot-splice.sh
--- a/more/chroot-splice.sh	Sun Jan 17 11:41:47 2016 -0600
+++ b/more/chroot-splice.sh	Sun Jan 17 21:18:52 2016 -0600
@@ -3,9 +3,9 @@
 # Combine a root filesystem directory and a control image into an $ARCH-specific
 # chroot containing native build control files, suitable for chrooting into.
 
-if [ $# -ne 2 ]
+if [ $# -ne 1 ] && [ $# -ne 2 ]
 then
-  echo "usage: $0 "'$ARCH $CONTROL_IMAGE' >&2
+  echo "usage: $0 "'$ARCH [$CONTROL_IMAGE]' >&2
   exit 1
 fi
 
@@ -13,7 +13,7 @@
 
 for i in build/{root-filesystem,native-compiler}-"$1" "$2"
 do
-  if [ ! -e "$i" ]
+  if [ ! -z "$i" ] && [ ! -e "$i" ]
   then
     echo "No $i" >&2
     exit 1
@@ -40,12 +40,15 @@
 cp -lan "build/native-compiler-$1/." "$CHROOT" || exit 1
 
 # splice in control image
-if [ -d "$2" ]
+if [ $# -eq 2 ]
 then
-  mount -o bind "$2" "$CHROOT/mnt" &&
-  mount -o remount,ro "$CHROOT/mnt"|| exit 1
-else
-  mount -o loop "$2" "$CHROOT/mnt" || exit 1
+  if [ -d "$2" ]
+  then
+    mount -o bind "$2" "$CHROOT/mnt" &&
+    mount -o remount,ro "$CHROOT/mnt"|| exit 1
+  else
+    mount -o loop "$2" "$CHROOT/mnt" || exit 1
+  fi
 fi
 
 # Output some usage hints